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Oxygen isotopic determinations of sequentially erupted plagioclases in the 1974 magma of Fuego Volcano,Guatemala |
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| Authors: | W I Rose Jr I Friedman L G Woodruff |
| Institution: | 1. Michigan Technological University, 49931, Houghton, MI, USA 2. U. S. Geological Survey, 80225, Denver, CO, USA 3. Michigan Technological Univ., 49931, Houghton, MI, USA |
| Abstract: | Plagioclases in the 1974 high-Al basalt from Fuego Volcano have δO18 values of +6.0 to +8.5 per mil. Meteoric water cannot have played a significant role in Fuego’s magma. Large, weakly zone clear phenocrysts had δO18 values in the accepted mantle range, while patchyzoned and oscillatory-zoned plagioclases inferred to have formed later and shallower levels have slightly heavier oxygen isotopic ratios. |
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